The Ultimate Guide To Water Filters: A Buyers Guide
Whether your water smells like chlorine or just doesn’t taste quite right, you’re not alone. Many households across the UK turn to water filters to improve the quality, safety, and feel of their water; but with so many types of filters, cartridges, and systems out there – it’s easy to feel overwhelmed. That’s where our ultimate guide to water filters comes in.
In this guide, we’ll walk you through everything you need to know – what they are, how they work and which ones are best for different needs. Whether you’re looking to protect your appliances, improve your drinking water, or simply understand what’s flowing from your tap, this guide has been designed by our team of filtration experts to help you make confident, informed choices.
The Origins Of Filtration
The quest for clean drinking water is as old as human civilisation itself. Before we dive into the modern technology, let’s explore how today’s advanced systems evolved from some surprisingly clever ancient methods.
As the visual above shows, the pursuit for pure, safe drinking water is nothing new. While we have traded bamboo tubes and brass vessels for highly engineered plastics, the underlying science remains exactly the same. Ancient civilisations were already mastering the core principles of mechanical trapping (like the Mayans using porous limestone) and chemical adsorption (like the Egyptians using charcoal) that power the advanced systems plumbed into our homes today.
What Is A Water Filter?
So, what exactly is a water filter? A water filter is a device that physically removes unwanted particles, chemicals, or impurities from your water.
Unlike broader water treatment systems (such as reverse osmosis units or water softeners), water filters work by passing water through a material that traps or adsorbs contaminants – no electricity, no salt and no complex chemical processes.
In most home and commercial setups, a water filter generally consists of the following three simple components:
- Filter Housing: The outer vessel that contains the filter and directs water through it.
- Filter Cartridge: The replaceable element that contains the filtration media of choice.
- Filtration Media: The material inside the cartridge that actually filters the water.
These components all work together to improve water quality – but the specific type of filter you choose depends entirely on the problem you’re trying to solve.
The Main Types Of Water Filters
Here’s a quick overview of the filter types you’ll see throughout this guide:
- Sediment Filters – Useful for removing physical particles like sand, rust, dirt, and silt. They usually come in the form of a cartridge (wound, spun or pleated) or a filter bag.
- Carbon Filters – Great for improving the taste, smell and appearance of drinking water. Carbon filters reduce chlorine, organic chemicals, PFAS and other compounds that can affect the smell and flavour of your water.
- Inline Filters – Compact, self-contained filters often used for appliances like fridges, coffee machines, or under-sink drinking water systems.
- Media Filters – Cartridges filled with specialised media (such as pH correction minerals) designed to target specific issues like acidic water.
Benefits Of Water Filters
You may not be surprised to learn that the benefits of water filters go far beyond safer, healthier and tastier drinking water. In fact, most water-using appliances rely on a filter of some kind to operate effectively – think coffee machines, dishwashers and washing machines.
Let’s briefly explore some of the main benefits you can expect from a water filter, before we dive deeper into the different types available.
Healthier Drinking Water
Enjoy safer, healthier and more palatable drinking water from the comfort of your home
Protect Your Home
Protect your property, appliances and plumbing from sediment and limescale build up
Remove Contaminants
Remove chlorine, bacteria and reduce the presence of heavy metals, microplastics or PFAS
Better Tasting Water
Vastly improve the taste, smell and appearance of your drinking water
Save Money
Save money compared to buying bottled water or using a filter jug
Lower Carbon Footprint
Reduce single-use plastic waste and lower your household carbon footprint
Different Types Of Water Filter
Water filters come in several forms, each designed to solve a different kind of water-related problem. Choosing the right one depends on what you want to remove. Are you concerned about sediment, chemicals, tastes, odours, or specific contaminants? Below is a simple breakdown of the main filter types you’ll come across, along with their sub‑categories and typical uses.
Carbon filters are the go-to choice for improving taste, smell and chemical quality. They’re especially effective at removing chlorine and organic compounds, hence their popularity for drinking water applications.
Compressed carbon formed into a ‘block’ for an enhanced contact time. Excellent for removing chlorine, improving taste and odour. Especially common in under‑sink drinking water systems.
Best For
- Improving the taste of drinking water
- Removing chlorine and organics
- Moderate flow rates
Specially designed to remove chloramine from water (a chlorine‑ammonia disinfectant used by many water suppliers) with similar properties to a standard carbon block.
Best For
- Improving the taste of drinking water
- Removing chloramines from water
- Moderate flow rates
Loose carbon granules encapsulated within a filter cartridge. Improved flow rates with a lower drop in pressure compared to carbon block filters. Great for those with low water pressure.
Also common with these added media types:
- KDF: Targets heavy metals such as lead
- Polyphosphate: Inhibits limescale build-up
Best For
- Improving the taste of drinking water
- Removing chlorine and organics
- Moderate flow rates
Compact, self‑contained filters with easy-to-connect push fittings. Often used for fridges, coffee machines and under‑sink taps. Cost-effective and great for tight spaces, but limited by flow rate.
Also common with these added media types:
- KDF: Targets heavy metals such as lead
- Polyphosphate: Inhibits limescale build-up
Best For
- Single appliances such as a fridge or tap
- Use in tight spaces with limited access
- Low flow rate applications
Sediment filters remove physical particles from water, things like sand, rust, dirt, and silt. They’re often used as the first stage in a filtration setup because they protect other filters and appliances from clogging up.
A classic depth filter made from string wound tightly around a core. Its multi-layered structure is excellent at capturing particles of varying sizes throughout the entire depth of the cartridge.
Best For
- General sediment removal at a low cost
- Private water supplies (boreholes and wells)
- Moderate flow rates
Usually made from layers of polypropylene fibres thermally bonded or melt-blown together. Offering a consistent filtration rating with excellent resistance to chemical attack.
Best For
- General sediment removal at low cost
- Private water supplies (boreholes and wells)
- Moderate flow rates
Single layer of filtration media for trapping specific sizes of particulate. Made from a folded or ‘pleated’ material to increase surface area. Offers high flow rates with a low pressure drop.
Best For
- Economical bulk sediment removal
- Trapping specific particle sizes
- High flow rates
Extremely fine filtration using a porous ceramic media. Often used to remove bacteria, cysts and very fine particles. Great for use with drinking water or as part of a wider water treatment system.
Best For
- Protecting against sediment and bacteria
- Capturing fine sediment < 1 micron
- Low flow rate applications
Media filters are cartridges filled with a specific water treatment media, designed to target a particular issue at a small scale. They’re perfect for a single outlet (such as a drinking water tap) and small appliances.
Loose granules of activated carbon, the main component of granular carbon filters. Used to remove chlorine and organics.
Best For
- Improving the tasteof drinking water
- Removing chlorine and organic chemicals
Usually a form of calcium carbonate, used to raise the pH of acidic or already low pH water to protect pipes from corrosion.
Best For
- Raising the pH of acidic water
- Private water supplies (such as boreholes)
Specific limescale targeting with scale prevention media (TAC) as an effective salt-free alternative to traditional water softening.
Best For
- Reliable water softener alternative
- Low to moderate fow rate uses
Specially designed media used to target specific or difficult contaminants such as nitrates, fluoride and heavy metals such as iron or lead.
Best For
- Targeting specific water issues
- Generally low flow rate uses
Inline filters are small, twist-lock or push-fit filters that fit directly into a water line. They’re simple, compact and ideal for appliances or point of use drinking water. Often used with RO systems and water coolers.
Inline filters are compact and self-contained, often utilising easy push-fit connections which makes them great for tight spaces.
Common variations include:
- Carbon: To improve taste and remove chlorine
- DI Resin: For aquariums or spot-free rinsing
- pH Correction: Raises pH of acidic water
Best For
- Single appliances such as a fridge or tap
- Low flow rate applications
Which Water Filter Is Best?
We understand that choosing the right water filter isn’t just about performance – it’s also about convenience, cost and long term value. Below is a simplified comparison of the most common filtration options, their advantages, disadvantages, what they typically cost and what you can expect in terms of maintenance.
We’ve also added some ‘filtration solutions’ in the form of water softeners and RO systems to give you an additional point of reference. This will help you understand which solution offers the best value for your home.
Water Filter Jugs
Water Filter Jugs
Typical Costs
Upfront: £ (Low)
Ongoing: ££ (Moderate)
Upkeep: 30 Days
Advantages
- Doesn't require installation
- Generally low cost
- Easy to use
Disadvantages
- Very small capacity
- Requires frequent changes
- Bacteria can accumulate
Typical Costs
Upfront: £ (Low)
Ongoing: £ (Low)
Upkeep: 6-12 Months
Advantages
- Excellent for taste and odour
- Reduce chlorine and chemicals
- Affordable and long lasting
Disadvantages
- Not suitable for heavy sediment unless paired with a pre-filter
- Must be matched to flow rate
Typical Costs
Upfront: £ (Low)
Ongoing: £ (Low)
Upkeep: 6-12 Months
Advantages
- Protect appliances and systems
- Traps a broad range of particulate
- Generally low cost
Disadvantages
- Doesn't alter taste or remove chemicals
- Needs correct micron rating for best results
Typical Costs
Upfront: £-££ (Low/Moderate)
Ongoing: £-££ (Low/Moderate)
Upkeep: 3-6 Months (Variable)
Advantages
- Target specific issues
- Convenient range of sizes
- Great for small-scale treatment
Disadvantages
- Limited capacity
- Generally unsuitable for whole house use
Typical Costs
Upfront: £££ (High)
Ongoing: £ (Low)
Upkeep: Uses Salt & Water
Advantages
- Treats water for a whole house
- Removes and prevents limescale
- Protects boiler and appliances
Disadvantages
- Higher initial cost
- Usually harder to install
Typical Costs
Upfront: ££-£££ (Moderate/High)
Ongoing: ££ (Moderate)
Upkeep: Frequent Filter Changes
Advantages
- Up to 99.9% removal of contaminants
- Effectively "pure" water
- Great for feeding a single tap
Disadvantages
- Typically low flow rates
- Not suitable for whole house use
Water Filter Myths
Water filtration is very complex and technical. As a result, it is often over-simplified or misunderstood. Let’s take a look at some of the most common misconceptions and myths about water filtration, why they are misleading and what the reality actually looks like.
This is a common misconception. In reality, most under-sink and cartridge water filters are simple to maintain and very cost‑effective, especially compared to alternatives like filter jugs or bottled water. For example, a simple carbon filter cartridge for a single tap typically costs around £15 and lasts up to 12 months depending on usage. This often works out significantly cheaper per year than running a filter jug, which requires frequent replacement. Check out our Water Filter Jugs Versus Drinking Water Filter Systems comparison for more information.
This is a very common misunderstanding. While some water filters can soften water, this is only true for small scale applications. These filters can reduce hardness at a single tap or for a specific appliance, but they are not practical for whole house use. Salt free options like “TAC” can help prevent limescale formation, but they do not remove hardness minerals. For true whole house softening, a dedicated water softener is the best option, not a filter.
In reality no single filter can remove all contaminants from water, in the same way that no single medicine can cure every illness. Different contaminants require different types of filters and they all do different things. Sediment filters remove suspended particles, carbon filters remove chemicals and organics whilst UV kills microbes and so on. For more information on the various contaminants which could be hiding in your water, check out our What’s In My Drinking Water page. In most cases, you can also check the website of your water supplier for copies of a recent water analysis.
Larger sized filters allow for higher flow rates – but there is of course a balance between something enormous and something practical. We always suggest checking the recommended flow rate of the filter cartridge (not the housing) against your requirements. This is because different types of filters can cope with different flow rates. Particularly important with carbon and media filters, to ensure adequate contact time for effective treatment.
Many harmful contaminants such as PFAS, lead, nitrates and bacteria are invisible to the naked eye. Just because water looks ‘clear’ in its appearance, doesn’t necessarily mean it is free from contaminants. Check out our What’s In My Drinking Water post to learn about some of the most common things found in UK tap water.
Choosing The Right Water Filter
Choosing the right water filter doesn’t need to be complicated. Luckily, there are a few quick and easy steps you can follow to help narrow down the best option for your home. We’ve broken each of these down below, with a handy interactive quiz for a quick and easy recommendation.
Step 1: Who Supplies Your Water?
Who supplies your water? Are you on a mains water supply (Eg; South East Water) or is it a private water supply such as a borehole, well or spring. This question helps establish the level of treatment likely to be required.
Step 2: What Problem Are You Trying To Solve?
What issue are you looking to resolve? For example, poor tasting or cloudy drinking water. This question helps guide you towards the correct solution for each particular issue.
Step 3: Where Will It Be Installed?
Where would you like it to be installed? For example, on the feed to a single tap (point of use) or the whole house. This final question helps to determine the size and type of solution required to solve your issue. Remember, a filter housing will be required for any ‘cartridge’ based solution, which is important to keep in mind for space-sensitive applications.
Once you’ve asked yourself these questions, you’ll be able to narrow down the filter you need in no time. If you’re on a private supply and don’t have a recent water analysis, check out our range of UKAS accredited water analysis options. For customers on a mains water supply, you can usually refer to a recent water analysis on your local water authority’s website.
For whole house setups, or those with a private water supply dealing with large volumes of water, it may be beneficial to explore a multi-stage filter cascade or a water treatment system instead of a single water filter. These systems utilise similar technologies to water filters, but are often designed for much higher flow rates, with built-in automated processes to control things like cleaning and flushing (such as a water softener).
Final Considerations
In this comprehensive guide to water filters, we’ve covered key topics to help you make an informed decision. Installing a water filter in the UK can offer significant advantages in terms of water quality, taste and health. By considering the information provided in this guide and factoring in potential costs, you can make the right choice for your needs and budget.
Browse our comprehensive range of water filters today. For help finding the best option and for general support, please reach out to a member of our team. We’re available Monday to Friday (9am to 5pm) by email, phone or live chat.
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